If it's a short shopping trip, then it's easier than a longer one, as the novelty will wear off, but you could always say, 'Once this shopping is done, how about you and me go and have a hot chocolate together / go to the play centre together / go home and do some finger painting...' anything she likes doing with just the two of you, with undivided attention? Marisa loves stickers, bubbles and balloons too. But if you are going to be a couple of hours, it's going to be hard for her to understand the concept of time and she will be sick of waiting. Always choose the times you go shopping well, avoid food times - I find first thing to be easiest. Let her help you, take things off the shelves, give money etc. Take a family member with you to help is good too. It's not always easy, I could never take Marisa shopping on my own...now she's 4 it's much easier but shorter trips are still the go.